{
  "createdOn": 1713709200233,
  "submittedHow": "web",
  "subject": "EP240420a: TNT upper limit to its optical counterpart",
  "submitter": "Wenxiong Li <liwenxiong1992@gmail.com>",
  "bibcode": "2024GCN.36210....1M",
  "circularId": 36210,
  "body": "J. Mo, X. F. Wang, H. W. Peng (THU), X. Li (BJP), Y. G. Sun, W. X. Li (NAOC) report the optical follow-up observations of EP240420a (Zhang et al., GCN 36194, Han et al., GCN 36203). These observations were conducted on 2024 April 20.75 UT in g and r bands, at ~4 hours after the EP-WXT detection, using the 80-cm Tsinghua-NAOC Telescope (TNT) located at Xinglong Observatory, Hebei Province, China. No optical counterpart candidates were detected.\nThe 3-sigma upper limits are reported as below:\ng ~ 21.6 mag\nr ~ 21.9 mag\nFurther followup observations are encouraged.\n",
  "eventId": "EP240420a"
}